Fix description of id field in GroupBaseInfo

This field contains the UUID of the group, not the numeric group ID of
Gerrit internal groups.

Change-Id: I1e258c224b97a767b16ce8d3631b41d4840ecb71
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 3137e16..495c70d 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -5379,7 +5379,7 @@
 [options="header",cols="1,6"]
 |==========================
 |Field Name    |Description
-|`id`          |The id of the group.
+|`id`          |The UUID of the group.
 |`name`        |The name of the group.
 |==========================